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Shareholders' Equity - Accumulated Other Comprehensive Income (Loss) - Components and Changes of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ (1,488) $ (2,088)
Other comprehensive loss before reclassifications, net of taxes (84) 34
Amounts reclassified into income, net of taxes 12 11
Ending balance (1,559) (2,043)
Foreign Currency Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (987) (1,292)
Other comprehensive loss before reclassifications, net of taxes (80) 41
Amounts reclassified into income, net of taxes 0 0
Ending balance (1,067) (1,251)
Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (574) (784)
Other comprehensive loss before reclassifications, net of taxes 0 0
Amounts reclassified into income, net of taxes 11 11
Ending balance (563) (774)
Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 75 (10)
Other comprehensive loss before reclassifications, net of taxes (4) (7)
Amounts reclassified into income, net of taxes 1 0
Ending balance $ 73 $ (17)